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As Martin has put a question in the technical section about the stag jackshaft/waterpump but has had no replies.
Would it be better in the main section?
Apologies if it has been sorted.
Martin the backlash of half a tooth sounds excessive to me. I had a failure of the water pump shaft which eventually caused it to 'jump teeth'. It was caused by a batch of shafts that were not hardened. Even after failure the teeth on the jackshaft were perfect.
Attached is a pic showing 2 shafts, the 'soft' failed one and a replacement. You can easily check the hardness by several strokes with the corner of a needle file on a non functional area. The file cut into the 'soft' shaft but just skated across the correctly hardened shaft.
I would urge anyone to do this test on any pump they are replacing.
- Alanpump shaft.jpg
PS I couldn't reply to a post in the technical section, perhaps its a feature?
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